mirror of
https://github.com/FFmpeg/FFmpeg.git
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253 lines
8.1 KiB
C
253 lines
8.1 KiB
C
/*
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* Pictor/PC Paint decoder
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* Copyright (c) 2010 Peter Ross <pross@xvid.org>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Pictor/PC Paint decoder
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*/
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "cga_data.h"
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#include "internal.h"
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typedef struct PicContext {
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int width, height;
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int nb_planes;
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GetByteContext g;
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} PicContext;
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static void picmemset_8bpp(PicContext *s, AVFrame *frame, int value, int run,
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int *x, int *y)
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{
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while (run > 0) {
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uint8_t *d = frame->data[0] + *y * frame->linesize[0];
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if (*x + run >= s->width) {
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int n = s->width - *x;
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memset(d + *x, value, n);
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run -= n;
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*x = 0;
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*y -= 1;
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if (*y < 0)
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break;
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} else {
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memset(d + *x, value, run);
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*x += run;
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break;
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}
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}
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}
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static void picmemset(PicContext *s, AVFrame *frame, int value, int run,
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int *x, int *y, int *plane, int bits_per_plane)
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{
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uint8_t *d;
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int shift = *plane * bits_per_plane;
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int mask = ((1 << bits_per_plane) - 1) << shift;
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value <<= shift;
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while (run > 0) {
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int j;
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for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
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d = frame->data[0] + *y * frame->linesize[0];
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d[*x] |= (value >> j) & mask;
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*x += 1;
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if (*x == s->width) {
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*y -= 1;
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*x = 0;
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if (*y < 0) {
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*y = s->height - 1;
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*plane += 1;
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value <<= bits_per_plane;
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mask <<= bits_per_plane;
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if (*plane >= s->nb_planes)
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break;
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}
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}
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}
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run--;
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}
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}
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static const uint8_t cga_mode45_index[6][4] = {
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[0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity
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[1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity
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[2] = { 0, 3, 4, 7 }, // mode5, low intensity
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[3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
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[4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
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[5] = { 0, 11, 12, 15 }, // mode5, high intensity
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};
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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PicContext *s = avctx->priv_data;
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AVFrame *frame = data;
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uint32_t *palette;
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int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
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int i, x, y, plane, tmp, ret;
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bytestream2_init(&s->g, avpkt->data, avpkt->size);
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if (bytestream2_get_bytes_left(&s->g) < 11)
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return AVERROR_INVALIDDATA;
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if (bytestream2_get_le16u(&s->g) != 0x1234)
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return AVERROR_INVALIDDATA;
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s->width = bytestream2_get_le16u(&s->g);
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s->height = bytestream2_get_le16u(&s->g);
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bytestream2_skip(&s->g, 4);
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tmp = bytestream2_get_byteu(&s->g);
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bits_per_plane = tmp & 0xF;
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s->nb_planes = (tmp >> 4) + 1;
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bpp = bits_per_plane * s->nb_planes;
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if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
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avpriv_request_sample(s, "Unsupported bit depth");
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return AVERROR_PATCHWELCOME;
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}
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if (bytestream2_peek_byte(&s->g) == 0xFF) {
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bytestream2_skip(&s->g, 2);
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etype = bytestream2_get_le16(&s->g);
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esize = bytestream2_get_le16(&s->g);
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if (bytestream2_get_bytes_left(&s->g) < esize)
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return AVERROR_INVALIDDATA;
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} else {
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etype = -1;
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esize = 0;
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}
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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if (s->width != avctx->width && s->height != avctx->height) {
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if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
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return -1;
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avcodec_set_dimensions(avctx, s->width, s->height);
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}
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return ret;
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}
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memset(frame->data[0], 0, s->height * frame->linesize[0]);
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->palette_has_changed = 1;
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pos_after_pal = bytestream2_tell(&s->g) + esize;
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palette = (uint32_t*)frame->data[1];
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if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) {
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int idx = bytestream2_get_byte(&s->g);
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npal = 4;
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for (i = 0; i < npal; i++)
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palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
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} else if (etype == 2) {
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npal = FFMIN(esize, 16);
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for (i = 0; i < npal; i++) {
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int pal_idx = bytestream2_get_byte(&s->g);
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palette[i] = ff_cga_palette[FFMIN(pal_idx, 16)];
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}
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} else if (etype == 3) {
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npal = FFMIN(esize, 16);
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for (i = 0; i < npal; i++) {
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int pal_idx = bytestream2_get_byte(&s->g);
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palette[i] = ff_ega_palette[FFMIN(pal_idx, 63)];
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}
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} else if (etype == 4 || etype == 5) {
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npal = FFMIN(esize / 3, 256);
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for (i = 0; i < npal; i++)
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palette[i] = bytestream2_get_be24(&s->g) << 2;
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} else {
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if (bpp == 1) {
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npal = 2;
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palette[0] = 0x000000;
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palette[1] = 0xFFFFFF;
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} else if (bpp == 2) {
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npal = 4;
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for (i = 0; i < npal; i++)
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palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
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} else {
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npal = 16;
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memcpy(palette, ff_cga_palette, npal * 4);
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}
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}
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// fill remaining palette entries
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memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
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// skip remaining palette bytes
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bytestream2_seek(&s->g, pos_after_pal, SEEK_SET);
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x = 0;
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y = s->height - 1;
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plane = 0;
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if (bytestream2_get_le16(&s->g)) {
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while (bytestream2_get_bytes_left(&s->g) >= 6) {
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int stop_size, marker, t1, t2;
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t1 = bytestream2_get_bytes_left(&s->g);
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t2 = bytestream2_get_le16(&s->g);
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stop_size = t1 - FFMIN(t1, t2);
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// ignore uncompressed block size
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bytestream2_skip(&s->g, 2);
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marker = bytestream2_get_byte(&s->g);
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while (plane < s->nb_planes &&
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bytestream2_get_bytes_left(&s->g) > stop_size) {
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int run = 1;
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int val = bytestream2_get_byte(&s->g);
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if (val == marker) {
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run = bytestream2_get_byte(&s->g);
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if (run == 0)
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run = bytestream2_get_le16(&s->g);
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val = bytestream2_get_byte(&s->g);
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}
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if (!bytestream2_get_bytes_left(&s->g))
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break;
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if (bits_per_plane == 8) {
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picmemset_8bpp(s, frame, val, run, &x, &y);
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if (y < 0)
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break;
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} else {
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picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
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}
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}
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}
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} else {
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avpriv_request_sample(s, "Uncompressed image");
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return avpkt->size;
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}
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*got_frame = 1;
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return avpkt->size;
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}
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AVCodec ff_pictor_decoder = {
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.name = "pictor",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PICTOR,
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.priv_data_size = sizeof(PicContext),
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
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};
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